SOLUTION: The 2nd , 4th , and 7th terms of an AP are the first 3 consecutive terms of a GP . Find : a) the common difference b) the sum of the frst eight terms of the GP if the common differ
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Question 1175729: The 2nd , 4th , and 7th terms of an AP are the first 3 consecutive terms of a GP . Find : a) the common difference b) the sum of the frst eight terms of the GP if the common difference of the AP is 2
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
a)
In the AP:
, ,
In the GP: , or
, or
, or
if given , then
The common ratio of the GP is => Answer.
Check:
, ,
= , ,
Common ratio: same as =>confirmed
b) the sum of the first eight terms of the GP
....if and
=
=
=
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